Printing-press.



' 0. G. HARRIS.

I IIIIIIIIIII s. APPLICATION FILED FEB 1111111 6.

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O. G. HARRIS. Y PRINTING PRESS.

APPLICATION FILED FEB.14, 19 06.

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CHARLES GRANT HARRIS, OF NIIJES, OHIO, ASSIGNOR TO'THE HARRIS AUTOMATIC PRESS COMPANY, OF NILES, OHIO, A CORPORATION OF OHIO.

PRINTING-PRESS.

Specification of Letters Patent.

Patented Aug. 6, 1907.

Application filed February 14., 1906. Serial No. 301.062.

To all whom it may concern:

Be it knownthat 1, CHARLES GRANT HAnRrs, of Niles, in the county of Trumbull and State of Ohio, have invented certain new and useful Improvements in Printing-Presses; and I do hereby declare the following to be a full, clear, and exact description of the in vention, such as will enable others skilled in the art to which it appertains to make and use the same.

Lithograph printing is ordinarily performed by stop cylinder presses. In consequence, the output is not very great, since the impression cylinder has to remain idle while the traveling fiat stone is being returned.

According to my invention the stone is approximately semi-cylindrical, and is so mounted that the lines of pressure will be uniformly toward a central fixed bearing, and in consequence the stone is not only held as against displacement, but is free from all liability to break. The reduction of the stones surface does not interfere with its relation to such bearing, all such reductions being compensated for between the stone and the body of the cylinder of which it forms a part.

The invention will be hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical sectional view, parts of a press being conventionally indicated. Fig. 2 is a longitudinal sectional view of cause the rings 10 to tighten.

one-half the circumference.

the printing cylinder. Fig. 3 is a view in perspective thereof, with the stone section removed. 4 is a similar view of the stone. Fig. 5 is an end view showing the extent to which the stone section may be reduced.

Referring to the drawings, 1 designates the frame of a printing press, a portion only being shown; 2 the inking rollers; 3 the water rollers; 4 the feed rollers, and 5 the impression cylinder. v

6 is the printing cylinder. It is composed in part of metal and in part of stone, the latter occupying about The metallic portion consists of a body 7 having two circular end disks 8 from which project the journals 9. Concentrically mounted on disks 8, and working in screw threads there- .of, are the stone-retaining rings 10, which on their inner,

opposite faces, carry wedge-like ribs 12. The thread of one disk is a right-hand thread and that of the other a left-hand, so that any tendency of the stone to turn axially when engaging the impression cylinder will Extending longitudinally of body 7, on the flat face thereof, at or about the axis of the cylinder, is a key or spline 13 preferably formed with straight parallel sides.

14 is the stone section. It is approximately semicircular in cross-section, and fits against the fiat face of body 7 and between the end disks. The radius of the stone is slightly greater than that of the metallic body 7, which latter is not intended to engage the impression cylinder. In the ends of the stone are ll-grooves 15 which receive ribs 12, so that when the rings 10 are moved inwardly said ribs will enter the grooves and bear against the inner beveled walls thereof, holding the stone firmly in place. In the flat face of the stone is formed a longitudinal cut-out, curved approximately concentric to the working face of. the stone. This cutout accommodates a semi-circular bar'16, in the flat face whereof is a longitudinal'groove which conforms to the key 13. All pressure against the face of the stone is communicated directly against the smooth curved face of the bar 16, and in consequence there is no line on which the stone might be broken off. As the face of the stone is reduced from time to time by planing, the radius of the stone is maintained by moving it outwardly away from the metallic body 7. This is preferably accomplished by interposing filler plates 17 between the stone and the flat face of the body, thereby uniformly building out the stone and the pressure-re-- ceiving bar 16. Other'means vmay, however, be employed for compensating for the wear of the stone. Additional fillers may be added as the stone is still further reduced, the extent of so building up the stone section being limited only by the interlocking of bar 16 with the key. This will be readily understood by reference to Fig. 5 wherein several superposed plates 18 are shown.

In practice, all pressure against the face of the stone is communicateddirectly to the bar 16 and througli'it to the key. Not only is the stone lockedat its ends, but it is locked and braced at acommon central point toward which are directed all lines of pressure. In

consequence, the stone cannot be deflected by contact" reduced by planing is controlled by the introduction of the proper number of filler plates beneath it before the planing is begun. As the cylinder is revolved the face of the stone wi l be engaged by a suitable knife and the necessary reduction effected. When the stone is replaced in the press, such reduction is compensated for by the filler plates 18, and the inner walls of the grooves in the ends are also planed the necessary extent to allow the ribs 12 to engage therewith. A lithographing cylinder thus constructed may be employed in a rapidly operated cylinder press, and is especially designed for the style of press known as the Harris Automatic.

I claim as my invention 1. In a rotary printing press, a cylinder having a stone segment, and a bearing for the stone at or about the axis of the cylinder for receiving all lines of pressure against the segment, said bearing being curved substantially concentric to the face of the stone segment.

2. In a rotary printing press, a cylinder having a stone segment, and a fixedly held bar having a smooth curved face forming a bearing for the segment.

3. In a rotary printing press, a cylinder composed in part of stone, which occupies about one-half the circumference, a curved seat for said stone and means for locking the stone against said seat.

4. Ida rotary printing press, a cylinder composed .of two sections, one section being of metal and the other of stone, and means for interlocking the two sections at or about the axis of the cylinder, comprising a bearing surface curved substantially concentric to the face of the stone.

5. A cylinder composed of two sections, one section being of metal and the other of stone, means for interlocking the two sections at or about the axis of the cylinder, and means eugagingihe stone section for binding and holding it fixedly relative to said interlocking means.

6. A cylinder composed of two sections, one section being of metal and the other of stone, said metal section having a key or spline extended longitudinally thereof and a seat for said stone engaged by said key,said seat being curved substantially concentric to the face of the stone.

7. A cylinder composed of two sections, one section being of metal and the other of'stonc, said metal section having a key or spline extended longitudinally thereof, and a bar having a groove to accommodate said key, said bar fitting in said stone section.

8. A cylinder composed of two sections, one section being of stone and formed on a slightly greater radius than the other section, means forming an interloekingconnee tion between the two sections, and fillers interposed between the two sections for compensating for any wear or reduction in the face of the stone section,

9. A cylinder composed of two sections, one section being of stone and formed on a slightly greater radius than the other section, a key or spline for locking said stone section, and separate fillers interposed between the two sections for compensating for any wear or reduction in the face of the stone section.

. 10. A cylinder composed of a metallic body and a stone section, means for interlocking said body to the stone section at their meeting faces, and means for holding the said stone section in engagement'with said interlocking means, comprising binding rings engaging said stone section at its ends, said rings being movable in opposite directions.

11. A cylinder composed of a metallic body and a stone section, means for interlocking said body and stone section at their meeting faces, said body having end disks oppositely threaded on their peripheries, and binding rings axially adjustable on said disks, said rings holding said stone section in engagement with saidinterlocking means.

12. A cylinder composed of a metallic body, a stone section having a curved cut out, a bar fitted in said cut out and having a groove with opposite straight walls, a key or spline on said body fitting in said groove, means engaging the ends of the stone section for holding it in place, and filler plates interposed between the fiat faces of the two sections. 1

13. The combination with the body having a fiat face, a

key or spline extended longitudinally of such face and CHARLES GRANT. HARRIS.

- Witnesses:

FRANCIS S. MAGUIRE, VERNON E. Wnsr. 

